Window for stoves



May 9, 939.

l n l I amano :nooooo D. J. HOWARD WINDOW FOR STOVES Filed July 14, 1958 fr/eggs admitting such outside air'with'out danger of ex- Patented May 9, 1939 UNITED f STATES PATENT vori-"ICE rwrimow Fon sTovEs David J. Howard, Chicago, Ill., assigner to Quaker Manufacturing Company, Chicago, Ill., a,

corporation of Illinois Application myn, 193s, serial No. 219,114

'1 0' claims. Y v(o1. 12e- 193)v plosion because of the presence lin said outside air of inammable gases, vapors, and the like.

Other purposes will appear from time to time in the course of the specication and claims.

I illustrate my invention more or less diagrammaticallyinthe accompanying drawing where- Figure lgvis a perspective;

Figure 2 is a partial vertical section;

Figure 3 is a section on the line 3 3 of Figure 2 Figure 4 is a section on the line 4--4 o'f Figure 3; and

Figure 5 is a perspective view of the transparent pane.v

Referring to the drawing, l generally indicates an outer heater housing in which xmay be 1ocated any suitable inner heater body or drum 2, having inthe lower portion a mixing or burner chamber' generally indicated at 2a, the details of which do not-of themselves form part, of the present invention. It will be understood, however, that a liquid hydrocarbon is admitted 'to the bottom of the pot ormember 2a and mixed with air fiowingjn through apertures 3 in order .to maintain a heating iire located primarily l above the upper lip of the member 2a and within the drum 2. v

Whereas in an eicient hydrocarbon burner there is a minimum deposit of free carbon, Vnone the less under practical operating conditions a certain amount of carbon deposit Within the drum 2 at various points therein is inevitable.

l indicates a window frame which may be hinged as at 5 to provide a door closure for an aperture in the wall of the drum 2. Located Yin the door is a transparent pane 'I of mica or the like which is of such length as to leave aslot or opening 8 across the bottom thereof. This opening preferably extends entirely across lthe bottom of the exposed. portion ofthe mica member or'pane and is herein shown asV being merely a gap within the frame or aperture in which the mica pane is located. To support it l in proper position, the pane may have legs 1a.

9 is any suitable interior baille adapted to direct the air owing inwardly through said gap 8 upwardly across the inner face of the Ientire pane 1. For purposes of appearance and safety, I provide a layer of mesh, Wire cloth or; the like t0 which overlies the 'front of the pane 1v andalso the aperture 8, thus masking the aperture from the outside so far as the appearance of the element is concerned. The mesh I9 serves to protect the mica from breakage. It also permits a readyflow of air through the gap 8 into the interior of the burner. K Since there is a possibility that there may b iniiammable vapors,

,gases and the like in such air, the mesh Ill provides an important safety element since, if in.h iiammable vapors do iiow through the mesh and into the interior of the burner`and become ignited, the ame will not pass through the mesh and ignite the vapors outside It also adds to the sightliness of the device. Since these stoves `are prevailingly sold for home use, if the pane of mica were not masked by a sheet .of mesh the gap at the bottom of the mica would be apparent and unsightly.-

As illustrated in Figures/3 and 4the mesh l0. andthe pane 1 may be secured to the window frame 4 by an inner supplemental frame I2 andA fastening screwsV i8. 'Ihe frame i24 further serves as a spacer for the baille 9. Y

In the normal operation of the device, the iiame and hot products of combustion flow or circulate upwardly through the interior of the drum 2. Any carbon would, therefore, be carried upwardly and generally vertically and would be deposited on the inner faces of the walls of the drum 2. In the structure herein described; a constant circulation of outside air passes through the slot 8 and is directed by the baille 9 directly upwardly across the inner face of the mica pane 1. The eiect of this circulation of outsideair is positively to prevent the deposit of free carbon on the mica pane. Tests under practical conditions indicate that Whereas, if such circulation of air is prevented, the inner `face of the mica pane frequently becomesv clouded or entirely obscured by carbon or soot, the constant ow of air through the air gap 8 and upwardly across the inner face of the mica pane 1 keeps the pane entirely free from carbon and prevents any difficulty in observing the interior of the burner.

- It is important that the operatri be able to inspect flame conditions within the burner in connection with controlling the feed of fuel tothe pot' 2a, controlling the draft and the liquid. Furthermore, in addition to making it more difficuit emciently to operate the burner, the degrammatic, rather than as limiting me to the Idetails therein described and shown.

For example, while I nd it preferable to have a single gap or slot l across the bottom of the mica pane 1, I might employ a series of holes spaced sufllciently closely to maintain a substantially continuous flow ofair across the inner face oi' the member 1. It will be understood also that any other suitable means for directing a generally continuous ilow of air across the inner face oi' the member 1 may be employed. v Under some circumstances it may be practical to direct the air laterally from one or both sides of the pane 1 but Innd it preferable and more ,emcient to employ the bottom slot or gap since f the air which through such-slot and is directed by the bame l flows in the general direction of circulation of theheated gases of combustion, which is oi' course upwardly from the pot 2a toward the top of the burner, for escape through any suitable flue not herein shown.

Whereas I have described the pane 1 as being of mica, it will be understood that it may be formed of any suitable transparent material, for example of heat resisting glass or the like. It will be understood also that the form of the pane can be widely varied and it might be of irregular shape or even round. Any suitable air admission aperture may be employed, either at the' bottom orsides or all around the pane 1, with means for directing or baiiiing the air across the face and preferably upwardly across the face of the pane in order to prevent the deposit of soot, smoke or carbon. It will be understood that where I employ the term "soot" I wish it to be understood as broad enough to cover any soot, carbon particles or substances which are deposited by smoke or the by-products of combustion. and which would tend to fog, dirty or ob' scure the pane 1. i An additional effect of the passage of air across the inner face of the pane 1 is to act as an insulating medium'for keeping the pane cool and for preventing the opposite sides of the pane from being subjected to too widely different temperatures. Where the temperature differential is too great, condensation oi' the hot gases is likely to ltake place on the inner side oi' the pane, with re sultant deposit of smoke, soot or dirt particles,

o l "parent pane, said nettingoverlying and being l. In a stove, a combustion chamber and an:v observation window in the wall thereof, said win-'4 dow including ran outer air pervious member and an inner transparent air impervious member, saicll transparent member terminating shortof the bottom of said pervious member, whereby an air ad- .mission aperture underlies substantially the `entire width of said transparent member, and baille means for directing the air admitted through said aperture upwardly across the inner surface of the transparent member in the general direction of movement of the heated gases and by-products of combustion within the combustion cham ber.

2. In a stove, a combustion chamberl and an observation window in the wall thereof, .said

window including'an outerV layer of mesh and an inner transparent member, said inner transparent member terminating at its bottom above the bottom of the mesh, whereby an air admission aperture is provided underlying substantially the entire width of said transparent member, and bafile means for-directing air admitted through said aperture upwardly across the inner surface of the transparent member in the general direction of movement of the heated gases and by-products of combustion within the combustion chamber.

3'. In a stove, a combustion chamber and an observation window in the wall thereof, said window including a pane of transparent material having a recess extending across a substantial part of the lower edge thereof, said recess being bounded at each end by a downwardly extending supporting leg integral with the pane, a frame adapted to mask the edge of\said frame, including said legs, al body of mesh positioned forwardly of and masking said pane and the aperture so formed at the bottom thereof, and bafile means `within said frame adapted to direct the inflowing air directly across the inner face of saidobservation window in the wall thereof, said window including a transparent pane, said wall' having an air inlet aperture adjacent said pane, means for directing a flow of air from said aperture across the inner face of the pane, and for thereby preventing the deposit of soot on the pane, and means for preventing the ignition through said aperture of inflammable gases located outside of the stove, said means including a member of mesh associated with said pane and intercepting said aperture, said mesh member beingv adapted simultaneously to protect the transparent pane and to mask said aperture and render it substantially invisible to the observer.

5. In a stove, a combustion chamber and an observation window in the wall thereof, said window including a transparent pane, an air inlet aperture formed in and adjacent the bottom of said pane, and bailling means adapted positively to direct a ilow of air upwardly across and in general parallelism with the inner face of the pane, and for thereby preventing the deposit of soot thereon.

6. In a stove, a combustion chamber and an observation window in the wall thereof, said window including a transparent pane, an air inlet aperture formed in and adjacent the bottom of said pane, baiiling means adapted positively to direct a flow of air upwardly across and in general parallelism with the inner face of the e. and for thereby preventing the deposit soot thereon, and an air `-pervious netting positioned forwardly of and in close proximity to the transadapted to mask the entire en'ective surface of said pane and said air aperture. f

7. In a stove, a combustion vchamber having an opening for an observation window in a side wall thereof, said window including a transparent pane mounted to cover the opening except for an air inlet extending transversely adjacent the lower edge of the pane, and a transversely' extending baille member supported behind the air inlet and having a portion projecting upwardly substantially parallel to the pane and overlapping a lower portion thereof but spaced rearwardly therefrom to provide a -narrow vertical passage through which air entering through the inlet is directed upwardly in contact with the inner face of the pane.

V8. In a stove, a combustion chamber having an opening for an observation window in a side wall thereof, said window including a transparent pane mounted to cover the opening except for an air inlet extending transversely adjacent the loweredge of the pane, and a sheet of air pervious mesh material positioned in front of the pane and covering both the pane and air inlet/and a transversely extending bal'lle member supported behind the air inlet and having a portion projecting up-- wardly substantially parallel to the pane and overlapping a lower portion thereof but spaced rearwardly therefrom to provide a narrow vertical passage through which air entering through the inlet is directed upwardly in contact with the y 3 to cover the opening except for the air'inlet, and

a baille member supported behindthe air inlet and' having a portion projecting upwardly sub- `stantially parallel to the pane and overlapping a lower portion thereof but spaced rearwardly therefrom to provide a narrow vertical passage through which air entering through the inlet is directed upwardly in contact with the inner face of the pane.

10. In a stove, a combustion chamber having an opening for an observation window in a side wall thereof, said Window including a transparent pane apertured adjacent its lower edge portion to form an air inlet, the pane being mounted tofcover .the opening except for the air inlet, and a sheet of air pervious mesh material positioned in front of the pane and covering both the pane and air inlet, and a` baille member supported behind the air inlet and having a portion projecting upwardly substantially parallel to the pane and overlapping a lower portion thereof but spaced rearwardly therefrom to provide a narrow vertical passage through which air entering through the inlet. isdirected upwardly in contact with the inner face of the pane.

- DAVID J. HOWARD. 

